Fujitsu GENERAL AOHG18KMTA, Service Manual

Page: 83 / 158

2-32. E: A3. Compressor temperature error (Outdoor unit)
Indicator Indoor unit
Operation indicator 10 time flash
Timer indicator 3 time flash
Economy indicator Continuous flash
Error code E: A3
Detective actuator Compressor temperature thermistor
Protection stop by compressor temperature ≥ 108 °C
during compressor operation generated 2 times within
24 hours.
Forecast of cause
3-way valve not opened
EEV defective, strainer clogged
Outdoor unit operation failure, foreign matter on heat
exchanger
Compressor temperature thermistor failure
Insufficient refrigerant
Check point 1. Check if 3-way valve is open
If the 3-way valve is closed, open the 3-way valve and check operation.
NOTE: For cooling operation, check gas side of the 3-way valve.
For heating operation, check liquid side of the 3-way valve.
Check point 2. Check the electronic expansion valve (EEV) and strainer
• Check if EEV open.
Refer to outdoor unit Electronic Expansion Valve (EEV) in "Service parts information" on page
03-48.
• Check the strainer clogging.
Check point 3. Check the outdoor unit fan and heat exchanger
• Check for foreign object at heat exchanger
• Check if fan can be rotated by hand.
• Check the motor. (Refer to outdoor unit fan motor in "Service parts information" on page 03-
48.)
Check point 4. Check the compressor thermistor
The compressor temperature thermistor characteristics check. (Check by disconnecting thermistor
from PCB.)
NOTE: For the characteristics of the thermistor, refer to "Thermistor resistance values" on page
03-55.
2-32. E: A3. Compressor temperature error (Outdoor unit)
- (03-39) -
2. Troubleshooting with error code
TR
O
U
B
LESH
O
O
TI
N
G
TR
O
U
B
LESH
O
O
TI
N
G